so the edges -- because essentially you're talking about two pieces of eight inch glass. the edges are a little bit fragile. but, you know, that's what happens. essentially, you've got point of impact there, but it all stays together. and so in a quake or whatever, in an accident, auto glass, we used a lot of that in the auto industry, a lot of lamination. so this is what works pretty well for that. plastic, you know, plastic is easy. we're doing more complicated plastic, but great material, except scratches, it does all sorts of things, and it burns. not the perfect product. another instance that we're talking about, that is what do we do with mirrors.